Improvement in saw-mills



diluted gisten @nicht @til/iw.

PHILIP JOBSON AND MICHAEL C. JOBS0`N,.AOF=LOGKHAVEN, PENNSYL- VANIA.

` Leners Patent No. 105,804, dated July 26,1870.`

`I-LQIPROVEIENT IN SAW-MILLS. l

The SchduJerefen-ed to these Letters Patent and making part' of the same.

Toall 'whom 'it may concern:

Be it knownthat' I, PHILIP Jonson and MICHAEL G. JOBSON, of Lockhaven, in the county of Clinton and State of Pennsylvania, have invented a newfand improved Adjustable' Muleyfsaw- Head; and We do hereby declare the following to be a full, clear, and exact description of the same, referencev being Vhad to theaccompanyin'g drawing making a part ot' this speciiication, `in whichflstroke of the saw, and completed during the downstroke.- Sawsare, therefore, Yhung at an inclination,

termed overhang, in order that they may cut so far into the log during their down-strokes thatthe log, in its forward movement, will not strike the teeth during the rlp-stroke. `In `order that all the teeth may out y during the down-stroke, it is necessary that the feed be equal to the overhang, so as to bring the log closetothe teeth at the beginning of thel down-stroke. But,

` as the length of the feedV requires changing according to the nature ot' the log, the overhang should be made adjustable also, so vas to make it conform to the increased or diminished length of feed, for, if the feed be too long, thelog willbe crowded upon the saw, and break it, while, ifthe feed `he too short, only Ythe upper teethwll cut. u y 4 Our invention consists in an apparatus for rendering the saw-.head adjustable, in order to' accomplish the object stated. Y

A is the back of the saw-frame.

a is a yoke projecting forward from'the upper part of the back A. I Y

i b are the back guides, which arehung upon a pin `set crosswise of the yoke a,.so as to swing upon the same, said back `guides being coupled together by metal plates,and fixed thus at a suitable distance apart for the saw to be placed between them.

c cfare the front guides.

d are thev vdead-wedges, which connect the front and back guides. l

Ve c are the guards, placed outside the back guides b.

- f is the coupling which connects the lower ends of the guards e,.and guides the saw, whiclrpasses through a slot in the coupling.

h is a rack in the side of one of the guards c. v i isa pinion placed on the endof a shaft, k, that is mounted in a box on the back A, the pinion c gearing with the rack h. Y

l is a hand-wheel on the shaft k', by which'the guards i i .e may be raised or lowered.

m is a plate, fastened, at its upper end, to the back A, and standing 0E from .said back far enough to inclose three spur-gears, n1 o r, which mesh together.

s is a shaft passing through the plate m, and supporting the spur-gear n.

t u are bolts supporting the nuts c, passing through the back A, and entering the hack guides b, one bolt to eachuback guide. p

'u are nuts supporting the spur-gears cfr, and placed around the shafts t u, and `between the back A and plate m.

w is a hand-wheel on the shaft s.

On turning the 'hand-wheel w, the bolts t yu are rotated by means of thespur-gears a o o', `and' either run in or out through the nuts c, according to the direction in which the shafts s' are rotated.

The bolts either throwthe lower ends of the back and ii'ont guides b caway from the back A, or draw them toward it.

The upper end ofthe saw being placed between thev lower 'ends of said guides, its overhang is regulated according to their movements.

'We are aware of the'pateut of Morrison and Harms, dated May 4, 1869. We hereby disclaim the devices covered by that patent.

Having thus described our invention,

What we'claim as new, and desire to secure by Letters Patent, is'- The muley-saw head b c ,when hung upon theyoke a, which projects from the back A, and combined with the bolts t u, nuts fv, spurgears n o lr, shaft s, and

plate m, constructed, arranged, and operating as specilied.

PHILIP J OBSON. MICHAEL C. JOBSON. Witnesses: Y

' WM. P. MARR,-

T. C. HIrPLE. 

